Well, it's kinda short so there isn't much to do. I don't recommend clips or anything, maybe just wash it well and kinda give some shine and bounce to it. ^_^ There are special shampoos that'll help with that.

It depends on when you're heading back to school. If it's not any time soon, go for it! If it is, I don't recommend that you do that, since some teachers don't really approve and sometimes its against the rules.
Maybe you should let it grow out, that way there will be more ways to style it.

If you like it, sure.
You can also get feathers put in your hair. Just go to a hair salon that sells them, they're only around five dollars, and they're cute, even if I don't wear them. They come in a variety of colors.
And sometimes, if you just get your hair to look really healthy, jewelry will actually add to that & it looks really nice. ^_^